In the following question, two columns are given containing three phrases each. In the first column phrases are A, B, and C and in the second column, the phrases are D, E, and F. A phrase from the first column may or may not connect with phrase from the second column to make grammatically and contextually correct sentence. There are five options, four of which display the sequence(s) in which the phrases can be joined to form a grammatically and contextually correct sentence. If none of the options forms a correct sentence after combination, select ‘None of these’ as your answer.

Column 1	Column 2
A. Net-zero is the phrase that is used to mean that any CO2 emissions that can't be curbed by clean technology by 2050	D. will either be buried using carbon capture and storage or soaked up by plants and soils.
B. Many regions of space that are dark to our eyes, actually burn brightly in the radio waves that they give off and this	E. as similar collective action to limit greenhouse-gas emissions remains to be much more challenging.
C. Deforestation levels remain high, which could provide fuel for fires	F. allows astronomers to peer into star-forming regions or the heart of galaxies.